Email Template Code Injection in Dayrui XunRuiCMS

A vulnerability was identified in dayrui XunRuiCMS up to 4.7.4. Affected by this vulnerability is the function _get_tpl_content of the file dayrui/Fcms/Library/Notice.php of the component Email Template Rendering. The manipulation leads to code injection. The attack can be initiated remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.

Casky was already ahead

This CVE exploits attack patterns that Casky's 323matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

Dayrui XunRuiCMS versions up to 4.7.4 contain a critical code injection vulnerability in the email template rendering function _get_tpl_content within the Notice.php library file. By manipulating email template content, attackers can inject arbitrary code that executes on the server, leading to complete system compromise. This vulnerability affects organizations using XunRuiCMS for content management and email communications, particularly those running outdated versions. With a CVSS score of 7.3 and publicly available exploits, this represents an active threat requiring immediate patching across affected installations.

Casky's 323 mapped skills detect the attack patterns behind this vulnerability by correlating indicators across MITRE ATT&CK techniques TA0001 (Initial Access) and TA0043 (Reconnaissance). Claude AI's extended reasoning analyzes suspicious activity such as crafted email template submissions containing code syntax, abnormal template processing behaviors, and post-injection command execution patterns. Practitioners would observe findings indicating attempted or successful code injection via template parameters, unexpected process spawning from web application contexts, and modifications to template files containing executable payloads. The skills framework helps security teams identify both reconnaissance activity—where attackers probe for vulnerable XunRuiCMS installations—and exploitation attempts, enabling rapid response before code execution occurs.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

323 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-120348.

Abuse of Public-Facing API: Mobile API Abuse

mobile security · low

Run

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

MITRE ATT&CK Techniques

TA0001 TA0043

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